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Oct. 9, 1928. 1,687,039

. H. ROMP MOTOR FOR DRIVING HYDRO-EXTRACTORS Filed May 1926. 2 Sheets-Sheet 1 by We Oct. 9, 1928.

H. A. RpMP MOTOR FOR DRIVING- HYDRO-EXTRACTORS Filed May 3, 1926 2 Sheets$heet 2 fll lllll I,

i atented Oct. 9, 1928.

UNITED/STATES, PATENT oFFic HENDRIX ARNOLD ROMP, OF NETHERLANDS, ASSIGNOR TO NAAMLOOZE VENNOOTSCHAP -NEDERLANDSCHE KUNSTZIJDEFABRIEK, ARNHEM, NETHER- LANDS.

: duo'ron. FOR DRIVING HYDRO-EXTRACTORS.

Application filed May 3,; 1926, Serial No. 106,530, 'and in the Netherlands February 13, 1926.

My invention relates to motors for driving centrifuges andhas for its object-to provide a motorfor this purpose, which is. very compact and therefore takes up; little space,

while it has very great stability. Thennmber of component parts is relatively small, which increases the reliability in working.

The new motor according to my present invention is particularly suitable .for driving centrifuges such? as areused in the artificial silk industry. and in which -as. is knownit is of the; greatest importance. to

prevent. oscillations, ,sinoevibrations have a detrimental effectbnthe qualityof the artificialsilk. a: J.

In the known motors of this type: the rotor shaft must not; perform. any lateral moyements, as the rotor would otherwise come' in contact with the stator, 'since.the -pole pieces 2 .on the 'statonusuallypnly provide .a-clearance of about 0,5? @min. for ,the cylindrical rotor. uch m te s ha e? i n. i f rea nmsu l y en bui t w t ztwo. fixed-ibear ng wazsp r ical joint'outside the said; fixed'bearings-and ccoigding my present invention a great simplification in the construction is effected, by the shaft of the hydro-extractor being supported by a single bearing only and by provision being made for ensuring the stability of the shaft by other means than a s ring'supported bearing.

ccording to my invention this stabilization may be produced among others by providing on the shaft of the hydro-extractor a spherical cage or rotor.

The stability may be further increased by the provision of a weight on the under side of the cage or rotor.

My present invention also includes a constructional form, in which the shaft of the hydro-extractor is supported in a rotary manner, such that the cage is capable of swinging about the centre of its spherical bounding surfaces.

Finally the core disposed within the spherical rotor and the pole-pieces disposed externally of the same ma be provided with spherical bounding sur aces.

My invention is more particularly described below with reference to the constructional examples of a motor for driving a hydro-extractor shown in the accompanying drawings. It is to be understood,

however, that the constructional features as shown are given by way of examples only and that several alterations are possible without departing from the scope of my inven- .A hydro-extractor 1 is mounted in any suitable manner on a'shaft 2, which-is supexample shown in Figure 1, the shaft 2 has a ,discoidal part-'5 provided with a cage or rotor 6 which, as shown in the drawing, may be provided with a weight in the form of a disc 7. The discs 5-,andf7 inthe examples= shown are made of a different metal to the rotor 6. The core 8 consists of a laminated body, which may for instance be fixed tothe column-4. O tside the cage or rotor 6 are ported in the point3 by; a column 4, In the the stator windings 9. The cage or rotor 6 'consists of' soft steel and is provided with radial saw cuts '10,-whichare, distributed over the surface and favorably influence the induced currents.

As will be seen from the drawings, the rotor 6, the core 8 and the pole pieces of the stator 9 are provided with spherical bounding surfaces, the centres of which practically coincide with the point of support 3 of the shaft 2. In the example shown in Figure 1 this support is indicated as a point which rests in a spherical depression on the column.

Obviously this support might be constructed in some other way, for instance a spherical bearing 11 might be used, as shown in Figure 2, having a convex spherical surface 12 which can turn freely in an accurately ground concave spherical depression. Although such a construction is preferred, any hearing may be used having freedom of movement in two directions.

On the hydro-extractor being started, the current which is led in through wires 13 will put the rotor 6 in motion. The elect/rd magnetic lines of force flow between the pole pieces of the stator windings 9 and the core 8, and through the rotor 6. Since the shaft 2 deviates from its perpendicular position, the rotor 6 will tilt down, for instance to the left of the drawing. The lines of force passing between the stator windings and the core 8 will then have the influence of pulling the rotor 6 in an upward direction restoring it to perpendicular position. lVhen the hydro-extractor is at rest or on the current being interrupted,-theweight 7-will still have a stabilizing effect.

It follows from what has been said, that the arrangement according to my present invention has among other advantages that of being particularly compact. As compared with the known motors of this kind, in which a spring supported bearing is used, the motor according to the present invention has the further advantage that no faults can develop, which would eventually occur through the varying stressing of the said springs.

The construction accordingto my present invention is also far more stable than other constructions of a known kind, as the body which is to be caused to rotate, for instance a can, is located considerably nearer the point of rotation than is the case in the normal machines.-ofthis-kind'2 In addition to this ilie'number oi componentparts isvery small, which has a very important effect on theprice,- whene such machines are manufactured on a large scale. The number of parts exposed to direct wear and-tear is exceedingly small, which ensures a longer life for the machine and greater reliability inworking;- v

'Iclaim: 1

'1; A motor for driving hydro-extractors comprising stator windings fixed to-a' casing, a column,-a- .coreyfixe'd to said" column, a rotor"betwe'en the pole-pieces of the stator windings and the core, the rotor, the core, and the'pole pieces of the stator' bing provided with spherical bounding surfaces, the centres of the latter substantially coinciding with the point of support of the shaft which supports the hydro-extractor.

2. A motor for driving hydro-extractors comprising stator windings fixed to a casing, a column, a core fixed to said column, a rotor between the pole 'pieces' -of the stator windings and the core, the rotor, the core, and the pole pieces of the statorbeing provided with spherical bounding surfaces, the centres of which substantially coinciding with the centre of a spherical depression arranged at the top of the column in which depression a convex spherical surface of a spherical hearing which supports the hydroextractor can freely turn;

3. A motor for driving hydro-extractors comprising stator windings fixed to a casing,

a column, a core consisting of a laminated body fixed to said column, a rotor between the core, the rotor, the core, and the pole pieces of the stator being provided with spherical-bounding surfaces, the centres of which practicallycoinciding with the point of support of the shaft which supports the hydro-extractor. l

4.'In a motor of the kind described,'a col-' umn, a rotor mounted on-said column and provided with aweight in the form of a disc having a central opening of a larger -diamete'r than=the column. p In testimony whereof Iafiix'my signature.

A; Row 

